| 摘要 |
FIELD: pneumatics; brake systems. SUBSTANCE: brake pneumatic booster has housing 10 with piston 20 provided with hub 34 and skirt 32. Piston forms in cylinder front chamber 16 constantly connected with vacuum source, and rear chamber 18 connected selectively either with front chamber 16 or with atmosphere through valve arrangement 60, 62 set into operation by control rod 54 pressing front surface of plunger 44 to rear surface of reacting disk 48 reliably secured to axial rod 52 and return spring 84 of control rod 54 arranged between piston 20 and plunger 44. Valve arrangement 60, 62 has shutter engaging with first circular seat 44a of valve made on plunger 44 and second circular seat 20a of valve made on piston 20. Shutter 60, 62 has flexible diaphragm secured by its outer side edge on piston 20 to provide sealing. According to invention, flexible diaphragm 60 is connected along its inner side edge, with provision of sealing, with rigid tubular part 62 sliding, with provision of sealing, in rear tubular part 22 of piston 20. EFFECT: enlarged operating capabilities. |
